<template>
  <div class="playList-offical">
    <h1>官方歌单</h1>
    <div class="wrapper" ref="wrapper">
      <ul class="content" ref="content">
        <li v-for="item in playListData" :key="item.content_id">
           <div class="cover">
             <img :src="item.cover" alt=""/>
             <span>{{ item.listen_num | numFilter }}万</span>
           </div>
             <span>{{ item.title }}</span>
        </li>
      </ul>
    </div>
  </div>
</template>
<script>
import axios from "axios";
import BScroll from "better-scroll";
export default {
  data() {
    return {
      playListData: [],
    };
  },
  created() {
    this.getPlayList();
  },
  methods: {
    getPlayList() {
      axios
        .get("/api/recommend/playlist/u")
        .then((res) => {
          console.log(res.data.data.list);
          this.playListData = res.data.data.list;
          //得到异步数据之后调用水平滚动方法
          this.betterScrollHorizontal(this.playListData.length,160)
        })
        .catch((err) => {
          console.error(err);
        });
    },
    betterScrollHorizontal(num, itemWidth) {      
        let width = num * itemWidth;
        this.$refs.content.style.width = width + "px";
        this.$nextTick(() => {
          this.scroll = new BScroll(this.$refs.wrapper, {
            click: true,
            startX: 0,
            scrollX: true,//横向为true
            scrollY: false,
        })
      })
    }
  },
  filters:{
    numFilter(value){
      return parseFloat(value/10000).toFixed(1);
    }
  }
};
</script>
<style scoped>
.playList-offical{
  width: 90%;
  margin: 0 auto;
}

.playList-offical > h1{
  font-size: 18px;
  text-align: left;
}

.wrapper{
  width: 100%;
  overflow: hidden;
}

ul.content > li {
  width: 160px;
  display: inline-block;
  text-align: center;
  vertical-align: top;
}

ul.content > li img {
  width: 90%;
  border-radius: 20px;

}

ul.content > li >span {
  display: block;
  width: 90%;
  margin:  0 auto;
  font-size: 12px;
}

.cover {
  position: relative;
}

.cover >span{
  display: block;
  position: absolute;
  right: 10px;
  bottom: 5px;
  z-index: 100;
  background-color: gray;
  border-radius: 20px;
  width: 100px;
  
}
</style>